I believe you could take a blank key and get it coded to the car's immobilizer system witha laptop running the VAG-COM diagnositc software, but you need the help of a dealer. I just did a search and this is my understanding of it.... Once they get in the car, they could run the diagnositic software to get an ID number for the immobilizer. They would then have to take that number and have a dealer give them a special corresponding code. They then go back to the car and program the blank key using the software and the code provided by the dealer. So if that's what they did, they either had the help of a dealer or had to fool one into giving them the code to your car.